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04-09-2017
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#11 |
 
Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
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Re: failure to start after warmed up
Fuel rail pressure is a variable. The system is designed for a constant pressure differential across the injector. The pressure in the Intake Plenum varies with throttle position, from high vacuum at idle to atmospheric pressure at full throttle. Therefore the Fuel Pressure Regulator is connected to plenum vacuum and adjusts fuel rail pressure to follow the changes.
As a rough check fuel pressure varies from 40 to 50 psi under normal conditions. The highest pressure you would see is with fuel pumps running, engine off, Ign ON/Engine OFF. The Field Service Manual gives exact parameters for testing and evaluating the FPR. Jim |
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04-09-2017
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#12 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,393
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Re: failure to start after warmed up
Ty,
My first replacement pump choice would be Delphi FE0039 $49.79 Rock Auto My Second Choice would be Airtex E3240 $38.79 Rock Auto I would also recommend replacing all of the plastic hose clamps with ss worm clamps. Be sure to rotate the gear housing to the inside to make it easier to install. Jagdpanzer & QB93Z are spot on. QB93Z probably has more real-world experience than anyone, considering the incredible trips he & Lindy have taken in ZR-1's and the years of volunteer support of time & facilities he has given to the WAZOO group. I'm proud to know them both personally as great friends.
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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04-09-2017
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#13 |
 Join Date: Aug 2014
Location: Crossville, TN
Posts: 88
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Re: failure to start after warmed up
Thank you, Captain! You were exactly right. I just talked to Jerry an he told me that you were great friends. He and I have corresponded quite a bit over the years. Going to order a new pump from him tonight. Put in a friend request, if you don't mind. Will update once the new pump is installed to bring some closure to this thread.
Best regards. Ty |
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04-10-2017
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#14 |
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Join Date: Jun 2008
Location: Alberta
Posts: 85
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Re: failure to start after warmed up
Thanks orthodoct, I am going out to inspect both my cars. I am also anxious to get a fuel pump jumper to try to help diagnose my no starts.
Sent from my iPhone using ZR-1 Net Registry
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LT5 |
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04-10-2017
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#15 |
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Join Date: Aug 2014
Location: Crossville, TN
Posts: 88
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Re: failure to start after warmed up
Good luck, my friend.
Ty |
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06-11-2017
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#16 | |
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Join Date: Aug 2014
Location: Crossville, TN
Posts: 88
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Re: failure to start after warmed up
Quote:
Sorry for long delay. Had a KNEE REPLACEMENT five weeks ago. Did a couple of thousand of them before I specialized my practice to shoulder and knee arthroscopy. Hurt like HELL and takes forever to get over. Finally well enough for some standing up tinkering. Checked fuel pressure below 176 and read 42psi. Ran to operating temp which is 192 with Mark's chip. Shut down and restarted fine. Waited 15 minutes attempted restart. Wouldn't start. Fuel pressure varied from zero to ten psi. Hobbled around a couple of weeks and changed pump assembly yesterday. Scared the hell out of me. Ran fine on warmup, but when I punched the secondaries in neutral, I killed every mosquito in the neighborhood. Scared that I had a broken valve or ring or something, but smoke symmetrical from both pipes and no oil odor. Dawned on me that I had disconnected negative battery terminal prior to pump change (I'm a private pilot as a hobby and burning to death ain't high on my bucket list) and I think that computer settings went to rich default settings and car hadn't been started since before my surgery so old gas in secondary injectors, "blowing out carbon", etc. ANYWAY, went for a short drive to reset everything (with GOLDCYCLON's trusty bypass jumper in my console just in case) and everything runs JUST FINE, problem solved. I promised to try to close this thread once less crippled and I'm glad that it had a happy ending. As usual, thanks to the brilliant guys with the Registry with whom I am proud to be associated. Special thanks to my friends the Captain, GOLDCYCLON, and of course Jerry without whom many of our cars would no longer be on the road. Ty Sent from my iPad using ZR-1 Net Registry |
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06-12-2017
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#17 |
  
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: failure to start after warmed up
Glad you got her up and running again. Take it easy on the knee. GC
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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06-12-2017
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#18 | |
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Join Date: Aug 2014
Location: Crossville, TN
Posts: 88
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Re: failure to start after warmed up
Quote:
Thank you, my friend! Ty Sent from my iPhone using ZR-1 Net Registry |
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06-12-2017
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#19 |
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Join Date: Jun 2013
Location: Toronto
Posts: 783
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Re: failure to start after warmed up
Happy to hear it was solved.
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06-14-2017
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#20 | |
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Join Date: Aug 2014
Location: Crossville, TN
Posts: 88
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Re: failure to start after warmed up
Quote:
Thank you, me too!! Sent from my iPhone using ZR-1 Net Registry |
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